Punch for metal.



PATENTED DEC. 25, 1906.

'0. L. (mans. v PUNCH FOR METAL. APPLIOATION FILED JAN.22. 1906 CHARLES L. GERDS, OF CHICAGO, ILLINO IS.

PUNCH FOR METAL.

Specification of Letters Patent.

Patented Dec. 25, 1906.

Application filed January 22,1906. Serial No. 297,125.

To ctZZ whom it may concern.-

Be it known that 1, CHARLES L. GER-BS, a citizen of the United States, residing in Chicago, in the county of Cook and State of Illinois, have invented a new and useful Improvement in Punches for Punching Holes in Steel or other Metal, of which the following is a specification.

My invention relates to an improvement in punches for punching holes in steel or other metal.

Heretofore hardened-steel punches have usually been made with an integral enlarged or collar portion at their upper ends to give the required broad bearing-face against the stock or plunger and to fit the socket of the hollow nut or coupling by which the punch is connected to the stock or plunger, the punch having but one cutting or operative end, and such steel punches are expensive to manufacture, as they require a piece of tool-steel of the diameter of the enlargement of the collar out of which to make the punch and also considerable time and labor in turning the lower portion of the punch down to the required size. Such punches are also somewhat difficult to properly temper, owing to the unequal size and diameter at their upper or collar ends, and when the lower or operative end of the punch wears out or breaks the whole becomes useless.

The object of my invention is to provide a punch of a strong, simple, effective, and durable construction by which these objections or'difficulties may be entirely overcome and which will be double-acting or reversible and which may be manufactured at small cost.

I have discovered and demonstrated by extended experiments that by combining with a punch made of the same shape and size at both ends a separate-piece split or segmental collar surrounding the upper portion of the punch and fitting at its upper end flush with the upper end of the punch against the lower face of the stock or plunger the upper end of the punch, though nearly of the same size and diameter as its lower end, will be so firmly confined and ripped by the separatepiece segmental col ar through the cooperative action of the coupling or nut that the upper end of the punch will not tend to cut into the lower face of the stock or plunger, as might be supposed, or to be itself upset or injured by its abutment against the lower face of the plunger or stock; and my invention consists in the means I employ to carry this discovery into practicethat is to say, it consists, in combination with the stock and nut or coupling and a double-ended punch of the same size and shape at both ends, of a split or segmental collar in a separate piece from the punch and having an exterior wedging face cooperating with the peripheral wall of the socket in the nut or coupling.

My invention also consists in the novel construction of parts and devices and in the novel combinations of parts and devices herein shown and described.

In the accompanying drawings, forming a part of this specification, Figure 1 is a side elevation, partly in central vertical section, of a punch embodyin my invention. Figs. 2 and 3 are horizontal sections on lines 2 2 and 3 3 of Fig. 1, and Fig. 4 is a detail elevation showing a modified form of the punch in which the central teat is omitted.

In the drawings, A represents the stock or plunger of the punching-press, having the customary exterior screw-threads a at its lower portion to receive the coupling-nut B, having interior screw-threads b and interior socket b to receive the collar of the punch, the wall 6 of this collar-socket being inclined or wedging.

.C is a separate-piece split or segmental collar fitting in the socket of the nut or coupling B and having a tapering or wedging exterior face, as c, engaging the corresponding tapering or wedging interior face I) of the coupling-socket.

D is my double-ended or reversible punch, having two cutting or operative ends d (1, both of the same size and shape, each portion (Z d being slightly ta ering from the extremity toward the mi die to give the punch the usual and customary clearance whichever end is being employed as the cutting or operative end. The separate-piece split or segmental collar Chas an interior slightlytapering face 0 corresponding to the tapering exterior periphery d d of the punch D. Each end of the double or reversible punch D may also be provided with the customary centering-teat d, and the punch-stockAis furnished with a central recess a at the center of its bearing-face a to receive this centering-teat on the end of the punch. The split or segmental collar 0 is preferably provided with an annular groove 0 to receive a wire or band C, which serves to hold the parts loosely together, and thus aids in handling the collar, as it keeps its parts or segments assembled.

Either end of the punch D may be used as the cutting or erative end, and when one end becomes du l or worn the punch may be very easily and quickly reversed. I- find in practice that the blows of the punch, however severe, do not tend to cause the upper end of the punch, however small in diameter it may be, to force itself into the stock A and injure the same, as the gripping action of the split or segmental-collar. the upper face 0 of which fits flush with the upper face of the punch against the lower end face of the stock, serves to. effectually prevent this and also to prevent any tendency of the upper operative face of the punch to be itself upset or injured. I

My improved punch may not-only be very I cheaply manufactured, as on an average it requires only about half the amount of toolsteel that the ordinary punch requires and saves a very large amount of labor and turning, but it is also practically twice as effective and durable as the old punches heretofore in-use, because it is reversible and has two equally good operative ends or cutting faces.

F is the lower die, G the stripper-plate of the punch or press, and X represents a plate of steel through which a hole has been punched by operation of the device.

I claim 1. In a punch, the combination with the stock or plunger and coupling or nut, of a double-ended or reversible punch having two operative ends of the same size and shape and a split or segmental collar, separate from the punch, fitting in the socket of the nut or coupling and surrounding and gripping the upper portion of the punch, and at its upper end fitting flush with the upper end of the punch against the, lower end face of the stock or plunger, said split or supplemental collar serving to prevent the upper cutting edge of the reversible punch from being upset or injured, substantially asspecified. V

2. In a punch, the combination with the stock or plunger and coupling of nut, of a double-ended or reversible punch having two operative ends of the same size and shape and a split or segmental collar, separate from the punch, fitting in thesocket of the nut or coupling and surrounding and gripping the upper portion of the punch, and at its upper end fitting flush with the upper end of the punch against the lower end face of the stock or plunger, said split or segmental collar having an exterior tapering wall engaging the wall of the socket of the nut or coupling, said split or supplemental collar serving to prevent the upper cutting edge of the reversible punch from being upset or injured, substantially as specified.

3. In a unch', the combination with the stock or 'p unger and coupling or nut, of a double-ended or reversible punch having two operative ends of the same size and shape and a split or segmental collar separate from the punch fitting in the socket of the nut or coupling and surrounding and gripping the upper portion of the punch and at its upper end fitting flush with the upper end of the punch against the lower end face of the stock or plunger, said split or segmental collar being provided with an annular groove and an encircling band fitting therein, said split or supplemental collar serving to prevent the upper cutting edge of the reversible punch from being upset or injured, substantially as specified.

4. The combination with a double-ended or reversible punch, of the punch stock or plunger, coupling-nut, and a split or segmental collar separate from and surrounding the upper portion of the punch and fitting in the socket of the nut or coupling, said split or supplemental collar serving to prevent the upper cutting edge of the reversible punch from being upset or injured, substantially as specified.

5. The combination with a double-ended or reversible punch, of thepunch stock or plunger, coupling-nut, and a split or segmental collar separate from and surrounding the upper portion of the punch and fitting in the socket of the nut or coupling, and having its upper end face flush with the upper end face of the punch, said split or supplemental collar serving to prevent the upper cutting edge of the reversible punch from being upset or injured, substantially as specified.

6. The combination with a double-ended or reversible punch, of the punch stock or plunger, coupling-nut, and a split or segmentalcollar separate from and surrounding the up er portion of the punch and fitting in the soc et of the nut or coupling, and having its upper face flush with the upper end face of the punch, said split or segmental collar having a tapering exterior, said split or supplemental collar serving to prevent the upper cutting edge of the reversible punch from beinga upset or injured, substantially as specifie 7. The combination with a double-ended or reversible punch having a centering teat at each end, of a punch-stock having a recess in its lower end face to receive said teat, a coup ling-nut and a split or segmental collar separate from the punch, said split or supplemental collar serving to prevent the upper cutting edge of the reversible punch from being upset or injured, substantially as specified.

CHARLES L. GERDS. Witnesses WM. L. ROWAN, JOHN A. HARRIS 

